Concept

Countercurrent exchange

Related publications (80)

Semi-analytical bifurcation analysis of two-phase flow in a heated channel

Using a drift flux representation for the two-phase flow, a new reduced order model has been developed to simulate density-wave oscillations (DWOs) in a heated channel. This model is then used to perform stability and semi-analytical bifurcation analysis, ...

2005

Calculated Volume and Energy Profiles for Water Exchange on t2g6 Rhodium(III) and Iridium(III) Hexaaquaions: Conclusive Evidence for an Ia Mechanism

André Merbach

An Ia mechanism was assigned for water exchange on the hexaaquaions Rh(OH2)63+ and Ir(OH2)63+ on the basis of negative ΔV⧧ experimental values (−4.2 and −5.7 cm3 mol-1, respectively). The use of ΔV⧧ as a mechanistic criterion was open to debate primarily b ...

2004

A Highly Stable Gadolinium Complex with a Fast, Associative Mechanism of Water Exchange

André Merbach, Lothar Helm, Gaëlle Nicolle

The stability and water exchange dynamics of gadolinium (GdIII) complexes are critical characteristics that determine their effectiveness as contrast agents for magnetic resonance imaging (MRI). A new heteropodal GdIII chelate, [Gd-TREN-bis(6-Me-HOPO)-(TAM ...

2003

Transferred cross-relaxation and cross-correlation in NMR. Effects of intermediate exchange on the determination of the conformation of bound ligands

Geoffrey Bodenhausen

Exchange transferred effects in soln.-state NMR expts. allow one to det. the conformation of ligands that are weakly bound to macromols. Exchange-transferred nuclear Overhauser effect spectroscopy (TR-NOESY) provides information about internuclear distance ...

2003

Multiple Steering Molecular Dynamics Applied to Water Exchange at Alkali Ions

Ursula Röthlisberger, Michele Cascella, Amos Maritan, Paolo Carloni, Leonardo Guidoni

The novel fast-growth or multiple steering mol. dynamics (MSMD) technique has been recently developed by Jarzynski to calc. free energy profiles along general transformation pathways (Phys. Rev. Lett. 1997, 78, 2690-2693; Phys. Rev. E 1997, 56, 5018-5035). ...

2002

Gd(III) based MRI contrast agents: improved physical meaning in a combined analysis of EPR and NMR data?

Lothar Helm, Alain Borel

A new global analysis of EPR, 17O NMR relaxation and chemical shift and 1H NMRD profiles with physically meaningful parameters for [Gd(DOTA)(H2O)]− and for [Gd(DTPA)(H2O)]2− in aqueous solution is presented (DOTA=1,4,7,10-tetraaza-1,4,7,10-tetrakis(carboxy ...

Elsevier2002

Development of a large-scale biocalorimeter to monitor and control bioprocesses

Urs von Stockar, Ian William Marison, Patrick Pugeaud

Calorimetry has shown real potential at bench-scale for chem. and biochem. processes. The aim of this work was therefore to scale-up the system by adaptation of a std. com. available 300-L pilot-scale bioreactor. To achieve this, all heat flows entering or ...

2002

Effects of controlled current on the response behavior of polymeric membrane ion-selective electrodes

Nico de Rooij

The influence of external currents on the potential response of polymeric membrane ion-selective electrodes (ISEs) is analyzed theoretically. The treatment is based on the well-established potential model of ISE membranes, extended by contributions from cu ...

2002

Fast heating and cooling for high temperature chemical microreactors

Albert Renken, Philippe Renaud, Lionel Paratte, Christine Alépée

Many chem. reactions, like the dehydrogenation of gaseous methanol to formaldehyde, require fast heating and cooling of the gases to control precisely the residence time at the reaction temp. (on the order of hundreds of ms) to minimize consecutive reactio ...

Springer2000

Approche de conception et d’optimisation de centrale solaire intégrée à cycle combiné inspirée de la méthode du pincement (partie II: réseau d’échangeurs de chaleur)

Daniel Favrat, El Hadj Malick Kane

Steam production units (HRSG and HSSG) of ISCCS include several heat exchangers (economizers, evaporator, superheater, reheaters, etc.). The knowledge of the extended composites as a function of the solar input, allows the determination of the most critica ...

1999

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